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The đàn bầu (Vietnamese: [ɗàːn.ɓə̀w]; "gourd zither"; Chữ Nôm: 彈匏), also called độc huyền cầm (獨絃琴, "one-string zither"; the name is only used by the Jing ethnicity in China) is a Vietnamese stringed instrument, in the form of a monochord (one-string) zither.
The đàn tứ (chữ Hán: 彈四) (tứ meaning "four" in Sino-Vietnamese, referring to the instrument's number of strings), also called đàn đoản (đoản meaning "short," referring to the instrument's neck) or đàn tứ tròn (tròn meaning "round"), is a traditional Vietnamese stringed musical instrument, this is short-necked, round-bodied lute derived from the Chinese yueqin, with ...
In abstract algebra, the Cartan–Brauer–Hua theorem (named after Richard Brauer, Élie Cartan, and Hua Luogeng) is a theorem pertaining to division rings.It says that given two division rings K ⊆ D such that xKx −1 is contained in K for every x not equal to 0 in D, either K is contained in the center of D, or K = D.